how to make an bright spot similar to a star?
For simple static lens flare you can try blender Composite nodes:

Light source very small Object with high Emission like 1000.
Big star is Glare node &gt; Simple Star
(Streaks works too, but I could not get them enough long)
Central effect is based on Glare node &gt; Ghost Fog &quot;scratched&quot; by Cloud Texture plus Sun Beams node.





For advanced  and more flexibility try this https://codeofart.com/flares-wizard/